/*
 * xloginsert.h
 *
 * Functions for generating WAL records
 *
 * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/access/xloginsert.h
 */
#ifndef XLOGINSERT_H
#define XLOGINSERT_H

#include "access/rmgr.h"
#include "access/xlogdefs.h"
#include "storage/block.h"
#include "storage/buf.h"
#include "storage/relfilenode.h"

/*
 * The minimum size of the WAL construction working area. If you need to
 * register more than XLR_NORMAL_MAX_BLOCK_ID block references or have more
 * than XLR_NORMAL_RDATAS data chunks in a single WAL record, you must call
 * XLogEnsureRecordSpace() first to allocate more working memory.
 */
#define XLR_NORMAL_MAX_BLOCK_ID        4
#define XLR_NORMAL_RDATAS            20

/* flags for XLogRegisterBuffer */
#define REGBUF_FORCE_IMAGE    0x01    /* force a full-page image */
#define REGBUF_NO_IMAGE        0x02    /* don't take a full-page image */
#define REGBUF_WILL_INIT    (0x04 | 0x02)    /* page will be re-initialized at
                                             * replay (implies NO_IMAGE) */
#define REGBUF_STANDARD        0x08    /* page follows "standard" page layout,
                                     * (data between pd_lower and pd_upper
                                     * will be skipped) */
#define REGBUF_KEEP_DATA    0x10    /* include data even if a full-page image
                                     * is taken */

/* prototypes for public functions in xloginsert.c: */
extern void XLogBeginInsert(void);
extern void XLogSetRecordFlags(uint8 flags);
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info);
extern void XLogEnsureRecordSpace(int nbuffers, int ndatas);
extern void XLogRegisterData(char *data, int len);
extern void XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags);
extern void XLogRegisterBlock(uint8 block_id, RelFileNode *rnode,
                  ForkNumber forknum, BlockNumber blknum, char *page,
                  uint8 flags);
extern void XLogRegisterBufData(uint8 block_id, char *data, int len);
extern void XLogResetInsertion(void);
extern bool XLogCheckBufferNeedsBackup(Buffer buffer);

extern XLogRecPtr log_newpage(RelFileNode *rnode, ForkNumber forkNum,
            BlockNumber blk, char *page, bool page_std);
extern XLogRecPtr log_newpage_buffer(Buffer buffer, bool page_std);
extern XLogRecPtr XLogSaveBufferForHint(Buffer buffer, bool buffer_std);

extern void InitXLogInsert(void);

#endif                            /* XLOGINSERT_H */
